Why won't my Samsung Infuse i997 ring when receiving calls?

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AC Question

samsung infuse i997 will not ring when recieving call other sounds work

When I switched to straight talk on my Samsung infuse i997 from at&t everything works except ringer phone will light up when call goes through but I miss calls because no tone. The thing that confused me when I get txt messages I receive tones so not the speaker, I would appreciate help with this problem its very frustrating.